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DAQ system for NA61

DAQ system for NA61. Zolt á n Fodor. TOF subsystem. Trigger unit. Trigger system. Readout electronics. Start. Fast start signal. Central event signal. Fast clear. Busy signals from other (sub)system. Busy signal. Read out processor. Time diagram of the trigger unit.

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DAQ system for NA61

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  1. DAQ system for NA61 Zoltán Fodor

  2. TOF subsystem Trigger unit Trigger system Readout electronics Start Fast start signal Central event signal Fast clear Busy signals from other (sub)system Busy signal Read out processor

  3. Time diagram of the trigger unit First start signal, time given by S11 Other busy signals Delayed start signal Central trigger for event selection Fast clear if no coincidence Start readout End of readout /from FIC/ Busy signal

  4. General layout TPC readout Central DAQ TOF readout Camac readout VME, memory modules PC-VME ??? PSD readout

  5. Busy logic • The trigger units of the subsystems provide a busy signal • The concentrators of the TPC readout provide also a busy signal • If all the system is free to get new event the trigger could start all the readout process independently hardware wise. • The CAMAC and TOF system through own trigger units • The TPC readout with the gate signal to the motherboards

  6. CAMAC readout • Modification • Modify the readout for standalone readout as the TOF system • We have the trigger unit for the connection to the FIC • The communication with the central daq through the memory-card in the same or other VME create connected to the pc with VME-PCI card /has to be checked!!/

  7. Processes • All the communication with the slow control system is not changed, today also this processor communicates with the DCS and online monitors • The central PC give the addresses for the subsystem readout /as NA49/ • Event building in the central PC

  8. Differences • In the NA49 DAQ • the central daq started the readout process for CAMAC readout. • The memory modules were in the central daq VME create • In the NA61 new DAQ • the trigger signal starts the readout. • The memory modules are in the readout creates or in a separate create for the communication with the PC of the TPC readout

  9. Advantages • If the central data taking is stopped, the online monitors can get data from subsystems, if the trigger is not blocked • The subsystems can send data independently from the central system for monitoring, detector control, …. • Easy to use only the subsystem daq for testing the detectors.

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